Perfoeated glass plates



(No Mode1.)

' J. E. SCHRECK,

MOLD FOR MAKING PBRFORATED GLASS PLATES.

Patented Apr. 7, 1885.

I J j I 1 z E S S E N T I W ATTORNEYS.

UNITE STATES PATENT OFFICE.

JOHN E. SCHRECK, OF NEW YORK, N. Y.

MOLD FOR MAKING PERFORATED GLASS PLATES.

SPECIFICATION forming part of Letters Patent No. 315,172, dated April 7, 1885.

Application filed January 12, 1885. (No model.)

To (ZZZ zz-hom it may concern.-

Be it known that I, JOHN E. SCI-IREOK, of the city, county, and State of New York, have invented a new and useful Improvement in Molds for Making Perforated Glass Plates, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a plan view of one of my in proved molds. Fig. 2 is a sectional side elevation of the'same, taken through the line 00 ac, Fig. 1. Fig. 3 is a plan View of the lower part of the same, part being broken away.

The object of this invention is to facilitate the making of perforated glass plates for use in making medicinal tablets, and for other uses.

The invention consists in the combination, with the base of a mold for making perforated glass plates, the lower die having perforations, and the upper die, of a follower having upwardly-projecting pins and side slots, and eccentrics working in the said slots and attached to a shaft provided with a handle, whereby perforated glass plates can be readily cast and removed from the mold, as will be hereinafter fully described and then claimed.

A is the base of the mold, which is made in the form of a short hollow cylinder open at both ends, and with an outwardly-projecting annular flange, B, at a little distance from its upper end, to form a seat for thelower die, 0. The lower die, 0, has a downwardly-projecting flange, D, around its edge to rest upon the flange B of the base A. The outer side-0f the upper end of the'baseA and the inner side of the flange D of the die 0 are beveled,as shown in Fig. 2, to cause the said die to rest firmly in its seat, where it is secured in place by screw-bolts E, passing through it and into the upper end of the base A.

Around the top of the lower die, 0, is formed a rabbet, F, having an undercut shoulder to receive the flange G, formed upon the lower side of the edge of the upper die, H, and having its inner side beveled, so as to draw the upper die down so closely upon the lower die as to prevent the melted glass from flowing in between the dies.

The upper die, H, is made in two semicircular parts, each of which has two lugs, I, at one end of its straight side, and one lug, J, at the other end. The lugs I of each part of the die interlock with the lugs J of the other part, and at the rear side of the die the interlocked lugs I J are permanently connected by apivoting-rivet, K, to hinge the two parts of the said die to each other. At the forward side of the die the interlocking lugs I J are connected,when the die is closed, bya detachable pin, L, which is made with a handle, for convenience in inserting and removing the said pin. At the forward side of the die H each of its parts is provided with a handle, M, for convenience in opening and closing the said die and placing it upon and removing it from the lower die, 0.

To the rabbeted upper edge of thelower die, 0, is attached a guide-pin, N, for convenience in adjusting the parts of the upper die in place upon the lower die.

In the adjacent edges of the parts of the upper die, H, is formed an opening, 0, through which the melted glass is poured into the mold. The upper part of the opening 0 is made eylindrical to receive the plunger, by means of which the melted glass is forced into the mold, as indicated in dotted lines in Fig. 2. The lower part of the opening 0 is made in the form of a slot, as shown in Fig. 1, to prevent the formation of too thick a burr upon the glass plate.

In the middle part of the upper side of the lower die, 0, is formed a recess of the shape and size of the required glass plate, and of a depth equal to the required thickness of the said plate.

Through the recessed part of the lower die, 0, are formed perforations P,corresponding in number, position, and size with the required perforations in the glass plate, and through which pass pins Q, formed upon or attached to a follower, R, fitting into the interior of the base A. The follower R is made in the form of a short cylinder havinga closed upper end to which the pins Q are attached, or upon which they are formed.

In the opposite sides of the follower R are formed slots S,to receive eccentrics T, attached to the shaft U, which rocks in hearings in the opposite sides of the base A. To one end of the shaft U is attached a handle, V, for convenience in turning the shaft U,and eccentrics '1, to raise and lower the follower R and pins Q. The pins Qare made of such a length that when the follower R is raised the upper ends of the said pins will come in contact with the lower surface of the upper die, H, as shown in Fig. 2. V

In using the mold the upper die, H, is adjusted in place upon the lower die, 0, the follower R is raised, and the melted glass is poured into the opening 0 and forced down into the mold and around the pins Q by a follower in the ordinary manner. Then the glass has hardened, the upper mold, H, is opened and removed,the follower R is lowered, withdrawing the pins Q from the glass plate, the upper cup-shaped part of burr is cut off with shears, the lower part of the burr is grasped with tongs, and the glass plate is raised from the die 0 and placed upon a flat shovel or plate, so that it will cool without bending, the withdrawal of the pins Q from the glass plate allowing the said plate to be readily raised from the mold.

Having thus described my invention, I claim 

